Question

The effects of testosterone include choose one?

a. A decrease in basal metabolic rate. b. Skin thins and becomes drier. c. Bone density increases. d. Hair growth slows down. e. All of the above choices are correct.

Which of the following events occurs during meiosis II?

Select one: a. Production of 4 genetically distinct daughter cells b. Crossing over of homologous chromosomes c. Production of 2 haploid daughter cells d. Production of 4 identical, diploid daughter cells e. DNA replication

The female mammary glands:

Select one:

a. are modified sweat glands.

b. may contain large amounts of adipose tissue.

c. are attached to the pectoralis major muscle by suspensory ligaments.

d. contain alveoli that pass milk into lactiferous ducts.

e. All of the above are correct.

Which of the following have begun to develop in a 5 week-old embryo?

Select one:

a. A backbone (with a tail, for now).

b. Limb buds

c. Brain

d. Eye

e. All of the above are correct.

Which hormone rises immediately after fertilization and is thus used to identify pregnancy on urine testing strips?

Select one:

a. Estrogen

b. Luteneizing hormone

c. Follicle stimulating hormone

d. Human chorionic gonadotropin

e. Progesterone

The male urethra is capable of transporting urine and semen, just not simultaneously.

Select one:

True

False

Erection of the male genetalia occurs due to parasympathetic control of the arterioles.

Select one:

True

False

When a sperm fertilizes an ovum, this typically occurs in the cervix.

Select one:

True

False

Primary oocytes are formed before birth.

Select one:

True

False

During the third trimester of pregnancy, most estrogen and progesterone is being produced by the placenta.

Select one:

True

False

The ectoderm germ layer in an embryo gives rise to the digestive and respiratory systems.

Select one:

True

False

The placenta forms 6-7 days after ovulation.

Select one:

True

False

If the sperm cell contains a Y chromosome, then the resulting embryo will develop testes.

Select one:

True

False

Answer 1

1. The effects of testosterone include choose one? E. all the choices are correct

Testosterone level is directly related to metabolism and a decrease in testosterone level slows down metabolism. Low testosterone level is also associated with thinning of the skin and it becomes dry. High testosterone level is also associated with increased bone density. Testosterone level also regulates hair growth. Low testosterone levels might reduce both body and facial hair in men.

2. Which of the following events occurs during meiosis II? a. Production of 4 genetically distinct daughter cells

Crossing over occurs during prophase I of meiosis I. At the end of meiosis I two haploid daughter cells are produced. Meiosis is a reduction division in which haploid daughter cells are produced, at the end of meiosis II four haploid genetically distinct daughter cells, are made. DNA replication occurs during the S phase of interphase.

3. The female mammary glands: E. all of the above are correct.

Mammary glands are modified sweat glands, contain adipose tissue, and the breast is attached to the pectoralis major muscle by suspensory ligaments and contain alveoli that open into lactiferous ducts.

4. Which of the following have begun to develop in a 5 week-old embryo?b. limb buds.

Brain development occurs in the first trimester. Eye development occurs at about three weeks. During 5-6 weeks buds for limbs develop and also buds for tail develops.

5. Which hormone rises immediately after fertilization and is thus used to identify pregnancy on urine testing strips? d. Human chorionic gonadotropin

(hCG is called as pregnancy hormone and this hormone is produced by placenta once the embryo implants in the uterus)

6. False (urethra carries both urine and semen)
7. True (Erection of the male genetalia occurs due to parasympathetic control of the arterioles. Erection of the male genital organ is considered one of the rare examples of the parasympathetic control of arterioles)
8. False (fertilization process occurs in the fallopian tube and not in the cervix. Cervix along with v-gina forms birth canal)
9. True (before birth meiosis I start in primary oocytes)
10. True (estrogen and progesterne are produced by the placenta that reaches there peak during third trimester)
11. False (endoderm is the germ layer that gives rise to the lining of the digestive and respiratory system)
12. False (placenta is not formed after ovulation, it will only be formed after fertilization)
13. True (as male is hetrozygous and females homozygous, the male Y chromosome fuses with X chromosome of women to form son)